The utility model discloses a combined -type crankshaft, it includes a plurality of bent axles bodies, and every bent axle body all includes two trunnions, two crank arms and a connecting rod neck, in two trunnions on every bent axle body, is provided with a connecting hole on one of them trunnion, wherein is provided with a connector on another trunnion, and all interference fit through connector and connecting hole of arbitrary adjacent two bent axles body are connected, the connecting rod neck all include a center pin and a metal covering, the both ends of center pin respectively with two perpendicular connections of crank arm, center pin, two crank arms and two trunnion integrated into one piece set up, the metal covering movable sleeve is put on the center pin, the both ends of metal covering offset in two crank arms respectively, are provided with the through -hole that is used for pouring into into lubricating oil to the clearance between metal covering and the center pin on the metal covering. The utility model discloses manufacturing is comparatively simple and convenient, and makes the connecting rod neck be difficult to take place wearing and tearing.